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Ludolph R, Nobile M, Hartung U, Castaldi S, Schulz PJ.Ludolph R, et al.J Public Health Res. 2015 Sep 4;4(2):559. doi: 10.4081/jphr.2015.559. eCollection 2015 Jul 16.J Public Health Res. 2015.PMID: 26425501Free PMC article.
Ludolph R, Allam A, Schulz PJ.Ludolph R, et al.J Med Internet Res. 2016 Jun 2;18(6):e137. doi: 10.2196/jmir.5430.J Med Internet Res. 2016.PMID: 27255736Free PMC article.